Sequence of cardiac activation, Biology

Assignment Help:

Sequence of Cardiac Activation

Depolarisation is initiated by an impulse form the SA node. Impulse spreads through both atria. Inter-atrial conduction and atrial myocardial depolarization creates the "P" wave in the cardiac cycle. The normal time taken is 0.08 to 0.12 seconds. The impulse reaches the AV node which delays the impulse about 0.04 to 0.01 seconds. The impulse is transmitted along the branches of the bundle of His to the Purkinje fibers, activating both ventricles almost simultaneously. Activation of ventricular muscle proceeds from apex towards base of heart. The time for a normal ventricular depolarization to occur is 0.06 to 0.10 seconds. PR interval represents the amount of time the electrical impulse takes form the beginning of atrial depolarization to the beginning of ventricular excitation. Normal time is 0.12 o 0.20 seconds. After depolarization, there is ventricular depolarization indicated by the "T" wave in the ECG.

The heart's electrical physiology serves to maintain a coordinated cycle for the electrical depolarization of myocardial fibers that produce chamber filling and emptying.


Related Discussions:- Sequence of cardiac activation

Explain the term brown-sequard syndrome, Explain the term Brown-Sequard Syn...

Explain the term Brown-Sequard Syndrome Brown-Sequard syndrome is a rare spinal disorder that results from an injury to one side of the spinal cord in which the spinal cord is

Control and informative function of organic molecules, Q. What are the few ...

Q. What are the few examples of the control and informative function of organic molecules? Based on genetic information, organic molecules control the entire work of the cell. D

What is dietary management of tuberculosis, Dietary Management It must ...

Dietary Management It must be evident to you that majority of the tuberculosis patients are emancipated and malnourished. Proper dietary management it during and  after the inf

Leishmanias – flagellates, Leishmanias – Flagellates Species of the ge...

Leishmanias – Flagellates Species of the genus Leishmania are parasites of mammals including man. Leishmanias infections occur over wide regions of the world from Asia, the ne

Polygonum type - monosporic embryo sacs, Polygonum Type - Monosporic Embryo...

Polygonum Type - Monosporic Embryo Sacs The embryo sac is formed from the chalazal megaspore in the tetrad and is eight-nucleate. The development of the embryo sac begins with

What are the non-protein ingredients, What are the non-protein ingredients ...

What are the non-protein ingredients The methods utilized for the removal of non-protein ingredients should be such that it should not affect the nutritional and functional pro

Protein case study, DK is a year old female who was born after a normal pre...

DK is a year old female who was born after a normal pregnancy and delivery.  At 17 months of age DK showed signs of speech delay, increased lethargy and vomiting up to four times p

Ventricular septal defect might be cyanotic, A newborn baby with a patent f...

A newborn baby with a patent foramen ovale or a ventricular septal defect might be cyanotic (blue). Will a two-year-old with these defects also be cyanotic? Explain your answer.

Overturn - thermal stratification, Overturn - Thermal stratification T...

Overturn - Thermal stratification The summer or winter stratification is seasonal. Circulation of lake water occurs twice a year, in the spring and autumn (fall) seasons by a

What are some evolutionary advantages of animals, What are some evolutionar...

What are some evolutionary advantages of animals with complete digestive tube? The complete digestive tube permits animals to continuously feed themselves without waiting for r

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd